Introduction
The BMC series grilles by MADEL are designed for use in air-conditioning, ventilation, and heating systems. These grilles are installed directly into circular ducts and feature adjustable blades to control the direction, height, and width of the airflow.

Classification and Material
The grilles are classified into two types: BMC Single deflection grille and CMC Double deflection grille. They are constructed from galvanized steel and include a seal on the back of the frame to ensure airtight contact.

Additional Accessories
An SD Damper, which is an angled slide cover for airflow control, is available. It operates via sliding plates with superimposed windows.

Fixing Systems and Finishes
The grilles can be fixed using visible screws (T). They are available in various finishes: M9006 (grey similar to RAL 9006), M9016 (white similar to RAL 9016), R9010 (white RAL 9010), and other RAL colors.

Specification Text
The document specifies the supply and mounting of a double deflection grille for circular ducts, featuring individually adjustable blades. The grille is constructed from galvanized steel and painted in grey M9006, with a steel flap damper and visible screw fixing.

Performance Data
The document provides detailed performance data, including free velocity, pressure loss, and sound power level. It includes recommended velocities, correction factors for pressure loss, and noise level adjustments based on blade positions.

Throw Characteristics
Data on throw characteristics without ceiling effect and with ceiling effect are provided, including correction factors for blade positions.

Conclusion
The BMC series grilles offer versatile solutions for airflow management in HVAC systems, with customizable options for installation and performance optimization.